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High-quality boron nitride nanotubes were synthesized by annealing porous precursor in flowing NH3 gas at 1150◦C. The porous precursor B18Ca2(MgO)9 was produced by self-propagation high-temperature synthesis (SHS) method using Mg, B2O3, and CaB6 as the starting materials, which played an important role in synthesis of BN nanotubes in large quantities. ÕâÆªÎÄÏ×ÖÐÒ²ÓÐÆøÌå£¨Æø»¯£¿£©£¬Êǰ±ÆøºÍǰÇýÎï·´Ó¦Éú³ÉBN£¬µ«ÊÇÈ´³ÆÎªÍË»ð£¬ÎªÊ²Ã´ÄØ£¿
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